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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5eb78dbdfffaf3be7ae4dbed0b9f8c32a3d2a121af0c97ee492284ca0287142' 
  AND token = '6kaG/S7erkkhS7kIbDhTI+uq0AR+mRmSBr94QCtA9+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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