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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b52ba02b4cba0a4fa0e1396bada84a9a6bd3f97b3d36c6a06d8b69925c13547' 
  AND token = '1lCEVEM+qwgS2w7HobTO0BdSiYA45iRSjVj2jti8Tm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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