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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dec8b8e3b143e475a12cf2afc0ddbfded5334295225d108781dd4aa90dfe3ef' 
  AND token = '5ufv8BERkM6tfrJriIo8GyEh/DKMPZwfilMTAsjIwbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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