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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752c7c3d66698b315a28a6b5a40953ee9e13a9845e142d3ade095aeff5981442' 
  AND token = '9fLWqIiwQ9FQ+aAe50vPUfK4OCkY+0sAc8LyPrPRnIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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