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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d15b99a67a58cd6c8712267216244388726a6d2fe2cfedb538daa3758488366' 
  AND token = 'l/hJXW7qGez3N1jLHQ+q7e6HlIJOrsQfcqaHG19jW2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}