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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1adeaec4ac76d64caea16c7c948d0cc77bfc01672db2b02aad861a28ff2f56bd' 
  AND token = 'ZdaqOrx4hQ75k1os/Su2g7M58NXS2myeL/baH0G8Vgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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