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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73db9fe6dd25914323a305d99aea77990b2ceb9ad059b4907f5e34dd333eeeaf' 
  AND token = 'sIEhG54b11hziiO3tawYqOlkr4oNf9pBLo2zmu/Wf0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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