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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5bfb8f01506a2a621bedb8887ff2da080f06d8b34caba9977926ffc9ddb9dd5' 
  AND token = 'GzJr7ft711er7Onp2sjG99WQMbUllVtuURJGhX/3KBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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