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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e63a63b5e21592cf60eb4671f339af30bad068a9024914f4c2a79b5e99f4e3c8' 
  AND token = 'IaiBFpnaYRjvNGJ0ViFflPx60wVvaMStnEkt6B+Yryw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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