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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '998e4e6589b022a8e73241a98b1ebcac206ade0a55db64fdeea16eb9da9d1929' 
  AND token = 'EJsP4NAIpG6tttb6CS8J6WRCKoEw1MzmPbVGh26K1lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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