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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d9bece40f85ff13c89b3df2ccf83ca41cc0af426713807519b1d997b0f09a53' 
  AND token = 'QYiSCn3mqC54En0aQHdnYeF52IlMhZnuZ3KaFu8Mg/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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