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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '045cb1703e919e27c4ec03b317f77a94e5dae3ddb9815ef0ff2636d558bfd326' 
  AND token = 'wdoVl9ny3k63F8x9eniPHybbl0PF11Vn14+NZqEuat4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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