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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7907cf8e8752c583b47510cdd4b1fcb32a009d09a05abad32d339f22532424e' 
  AND token = 'VfWwKCai6G9cpVuA9Qe7QL3ifgpbpdLghYS4gw3sBlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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