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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff2fff82c0fb5b8ef87f8955b648f3692fe68cf68db38eb977d934bfc49deae0' 
  AND token = 'sy599pH9adgIS6lDpdJIvt5Tgbdms87UvbMpYL2rz98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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