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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad53b90c98f72e770e9e6425d15d9fb15a8cb490c909ce05383f61027ddb808f' 
  AND token = 'BL412iOqlK7J9q5kfYTOMoiuzgNCFrqp5RqRCEOQXB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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