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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5d6f6ca24c114325481ef9bc1f45b185a5e76e7aefb702427fed9bda4cc3df6' 
  AND token = '9kxRVbVnk+9vph5m/M4Ntdp5uQBqttusQnbVjfS/8ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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