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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '792f3763fc3a4892376a8453bf249ef3a15c56e98e4171aa2191ffb50957f069' 
  AND token = 'nJ194S5aiXcpcEnubVc7ecmfQ4F1xLDiMwq9S8AoUew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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