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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81b6168c2f087cd678bb88cc0bc0b1bed48006d3b675ae5538a7d348ef2de7f1' 
  AND token = 'q3XhHyfVgQ/F49NZ3Sm95GaWctYjmiJlk03oMdor8mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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