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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4811a3c1e58bf4027999b8eb9cd061198c695fcdf93aa1d9a4401b0ee5d6a4c8' 
  AND token = '8yfXdAp3h+21kbzxCO4qqMdZMFStyEzvYDC+AKNMWuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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