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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f59b2d9daba859cd3d8ceff51890a58be3379bca04af94284984ace3709f0f' 
  AND token = 'vk0DyQPhlmVRLvtYobLcsWO0y0b6h04L1Ty02XY2G+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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