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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3212bb85fafc4fb2fb5b788c01eef5488bcd6d2f68c3bdf50b17b49f71f2b938' 
  AND token = 'qfXG5tYosVgMBiPTMlRduuHxONAZSTo6hywdNF4Yw6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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