SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ea799501f170532c5b78fc7d8bed3f2b30c46355c07c2a4f9fae2b768f6a219' 
  AND token = 'nfEZtdXdD9/L8cMAnjGMtJY+BVUu6S89ko3wthAWKao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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