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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaffa58ecc682b6d56d80f38fcdf8e7881de201fb87d2791a17a081aae04b4d3' 
  AND token = 'KkbJmAmMO2BahU3p/a1XPIbCNbRqXBJ5GH8MrAxZcTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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