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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99e10077a20100e5a23ae094e765f2b33b977aea6e5d6e6061e49c6dc685d171' 
  AND token = 'hPJOOg8i6H1QmVe3eYSV/Bg7f4xq21ExNThbpOGvcas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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