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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a11a92b5d6e8a260954b12e7b0f4b2768b4637b5a08945ed32435e114015e8e0' 
  AND token = 'bCnzefdphKO45jHRkIQvl+zG6MQlhy62HjeyVQEtkUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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