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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be341edd575df7bded63a6e94d8cb53aa8cbb3bdb60a04b9e2b9398a5747f6b' 
  AND token = 'CDH4jijI0QC8aeFaMF+/Bnk1dijkX67sp2+4dgxkPp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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