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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e0b55b7964300c519b355e4650d766e506ec357318ae889245b15afc84b3df3' 
  AND token = '5seFz1NxXwWaW/1dgU5uu83cObmL5cNTrVU1M02V4I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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