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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9d3c2d67e1b6b9f0348d83bace69ce243427b2eaf6fefe94aeb64dfd9f9b0dd' 
  AND token = 'vyhqlvzlsfNdIMu3nFUulCZKSaVwZZzVdj37sHrQ/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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