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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e9a30d2e76d106770da353faea7c14c1499421f9563cc26e5d7609d2cf6fcc5' 
  AND token = 't2FoLDntfhj/lE6dGJZXbXTdRIUNx/N5rYtAHNp5or0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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