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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10aa3c12c088ba3c66c79ed66efd5b72eb711108f032ad0acb07fa37ec2bf919' 
  AND token = 'VZjBMLSs4m0EDi96Cn/KlMTaPCiycvk5sTnk3oimGOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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