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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0de4634b4709687bd75e776a303a10d77df7cb54210037c50f72aecae446f510' 
  AND token = 'DADtyh9TJhzWtJb8pbosQ30kIGPPCXa9g6+r7PHuGBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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