SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85ed0f221e3a08f0be72d94561f566e3ac2efb03b3ab98a8a741e9091479a026' 
  AND token = 'EBoBQklqj8PNj0hnPZ1/RCfmTzAqyhmPV8O+SJLP/Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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