SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '215d9427884062deb1d5821746dc2d30122ff1b2640a73eb0f43881b2d0f33c6' 
  AND token = 'afjKiCiCdQpQGwk+9zZzU8SoG1Lou1qZqK21Y4p7HAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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