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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '019ae9137b3e71c2e9588ad361736b102eb1599c1c1b83cc4a05dc4e7f663db0' 
  AND token = '6z/7aGwG/uOk2ipDz/xQ+sZkOVGibj/bAS0S7htovd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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