Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62b1b2572c2b9aff8b33c9046ec06d3ad0fc1e582f65ae832431ec2aa8545ee8' 
  AND token = 'kHSBUNU/VQjZIGFeeQGsLA3n1CKsdiyuAesuXMj9BEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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