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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '956300fc8aef5a952c5276d06eadf83a6bb94f71d78f98c6d2ec91809e2aebbf' 
  AND token = '5MWhjp3xaqp04TXh/JnBtbpjTA807Sxe0/pNBT1kdf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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