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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa63b34bc26144d08fa701fefa20e1b81a06b21cb0e5344986205877cab3128e' 
  AND token = 'Q6NTSReojEMLW+eg/RnL5PgwpQ3b3GczUIAr9UsofMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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