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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '476b836980ab8af903a9616d1e9bdcb7b74cb834999fe2334124814ad6fc7dfe' 
  AND token = 'tQsFC7uNqnbiJCcQteI/o71bUnRgOjGP9YPWfaKxweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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