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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a774d1c29bf8f23af3e3c6afe4e8e9c9669dec29b5a09d9d6b79af7978636d7b' 
  AND token = '4t1XGPmx7o8LZ0GDvf2h2cUkVlW24UPYYBz0UoREemA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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