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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fc2040d4cf6142a216d0fbd6bf24c74808c2d772ee08764f6b7df57ae502ad2' 
  AND token = 'y5g6ZRLK/xsPCygf7K5DcE7r31bP7L7huZgFR0zMAFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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