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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dc25b03b7804f08b16629dae5bca4e6272ae3901e8390ee73e5c3c7a67dc163' 
  AND token = 'xBP+UTUXxOoeBrT9icm0WQQWz4XcjIK8Uxr9dKWnZpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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