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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e54ab99a060fbe9c0861878cde5c58fcbabf6dfcfbfda5998c1870be578956c5' 
  AND token = 'nOtTbSXNHSU3p8WYw64ZJhVfea63YbSkDO1bq1N0y+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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