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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52316a2c62d26f10cf0bf095c33cc1186ff8c926e6dc3665499fe9b6374fbe2d' 
  AND token = 'PlVLRtfpr4VzFf2/M1yPlBMUrGqZIakoxEA8KTyaGbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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