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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '900ddf74a292989d48227c3ea8fefe1eddeafcd289112e85e3fc71905196c29a' 
  AND token = 'N5zVYiQrbsvbFusoD1Grbvf2Cp5DexrDBa+FEoLVt2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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