SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db7fa4c01c309a0ba1b293a95844dbb38fc8f2b298a6f6f7b884a1f5a5d163a1' 
  AND token = '0JEV98Ng6nHzDnTXZHmKqfvnrXV4YLG1RHWiLkWZ4+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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