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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9019aa5b15e79ad1b6a278653dfa5b3d25b40c5d758fda698a04e23f948f6529' 
  AND token = '88hXs1Ck2tto5gW73zbETHVST+YXzmf1/GeSLQTb2Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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