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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24851bca84050693003bf696507bd8d77b0d2c450156e75fcd463063ba287109' 
  AND token = 'WuJ1dN+Q+AHa0T4y6N7XTpOvRnkXVGAZsqpjzb8X5S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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