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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '153b5ca6d375552c8482d0f3ed5495167a671f9278aad4f6c35c12b67c288519' 
  AND token = 'w9d068Tubb2q/x2NXNlsFMGylofiG7X49/bVrZlUz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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