SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4074bf6ee2c2ffd95f9f8956a97f864c3b79b6f5e85fedf4d13fdecf6a0c34b' 
  AND token = 'kpHL1Y7wtQq1TwHC3uhaPb/75iEqwvV+yKi/FSVy0kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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