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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87dd7e98840e63ff9232d1889d278d1a4ad1f8543ab86621afd0294397d3dd85' 
  AND token = 'KNOk9/EwQiXH6W3VEyUiPg8KOqpc5JpA8zrQRiIlp6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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