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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3959577e01378a78cc8dd6b5a2e5b99c068dff00710001a878e4e8c0115bbb53' 
  AND token = '5CbsL8b4yyK2NIx2DWkqZbiCZuLDx9i61Mk+gBFSZS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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